I have two, one in front and one in back, front doesn't frost over, one in back does. Both are battery powered. The one in front is on a covered porch, the one in back is not. I think that helps the front doorbell.
I have a 8 ring cameras and the only one that fogs up is the ring doorbell 2. So saying that this is a issue all outdoor cameras have is incorrect. I also have a couple of Arlo and one of them has fogged up once or twice in extremely humid weather with rain and literally heavy fog out. The other rings (floodlight cams etc) did not. This is obviously a design issue and since mine didn’t do it for the first 6 months I had a the ring doorbell 2 it leads me to believe something is breaking down in these that is allowing humidity to get into them. They need to fix this because just tonight for instance there hasn’t been any rain and no large temp swing. Temp went from about 52 at 5:00 pm to 38 at 5:00 am, not a cloud in the sky and the ring doorbell 2 is worthless - it’s all fogged up and will likely stay that way until around 10:00 or 12:00 the next morning. This is happening most nights now without any rain. Ring needs to fix this. My stickup can’t isn't fogging either just the ring doorbell 2. I even have a old original ring Doorbell about 50’ away and it’s not fogging up. It might have once or twice in the last couple of years but nothing like the ring 2.
Rain x does not work in a fogged ring door bell 2.Ring have now suggested i use halfords night and day.My ring 2 is only battery powerd i need to run wiring for power as current house has no existing door bell.
I am no reluctant as its usless at night. That said the ring floodlight on the same house same conditions has no fogging.I wish i didnt purchase the ring doorbell 2 its not made for british weather.